RT Journal Article SR Electronic T1 Classification in systemic sclerosis. JF The Journal of Rheumatology JO J Rheumatol FD The Journal of Rheumatology SP 840 OP 841 VO 33 IS 5 A1 Johnson, Sindhu R A1 Laxer, Ronald M YR 2006 UL http://www.jrheum.org/content/33/5/840.abstract AB